Lithium cobalt oxide, method for manufacturing the same, and nonaqueous electrolyte secondary battery
AssigneeNippon Chemical Industrial Co., Ltd.
InventorsHidekazu Awano, Yoshihide Ooishi, Nobuyuki Yamazaki
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Abstract
Lithium cobalt oxide, which can provide a nonaqueous electrolyte secondary battery having an excellent initial capacity and an excellent capacity retention, and a method for manufacturing the same are provided. The lithium cobalt oxide has a tap density of at least 1.7 g/cm3 and a pressed density of 3.5 to 4.0 g/cm3. A method for manufacturing the lithium cobalt oxide includes the step of selecting a lithium cobalt oxide (A) and a lithium cobalt oxide (B) so that a difference in the tap density between the lithium cobalt oxide (A) and the lithium cobalt oxide (B) is at least 0.2 g/cm3; and mixing the lithium cobalt oxide (A) and the lithium cobalt oxide (B).
Claims13
Lithium cobalt oxide comprising:
- a mixture of lithium cobalt oxide particles (A) and lithium cobalt oxide particles (B);
- wherein the lithium cobalt oxide particles (A) are composed of uniformly monodisperse particles, which refers to particles present independently of each other, and the lithium cobalt oxide particles (A) have an average particle diameter in a range of 5 to 30 μm;
- the lithium cobalt oxide particles (B) are composed of an aggregation of primary particles forming a secondary particle, and the secondary particles have an average particle diameter in a range of 0.1 to 10 μm;
- and
- wherein a tap density of the mixture of the lithium cobalt oxide particles (A) and the lithium cobalt oxide particles (B) is at least 1.7 g/cm3, and a pressed density of the mixture of the lithium cobalt oxide particles (A) and the lithium cobalt oxide particles (B) is 3.5 to 4.0 g/cm3.
A nonaqueous electrolyte secondary battery comprising a cathode plate having a cathode active material, wherein the cathode active material includes a mixture of lithium cobalt oxide particles (A) and lithium cobalt oxide particles (B);
- the lithium cobalt oxide particles (A) are composed of uniformly monodisperse particles, which refers to particles present independently of each other, and the lithium cobalt oxide particles (A) have an average particle diameter in a range of 5 to 30 μm;
- the lithium cobalt oxide particles (B) are composed of an aggregation of primary particles forming a secondary particle, and the secondary particles have an average particle diameter in a range of 0.1 to 10 μm;
- and
- wherein a tap density of the mixture of the lithium cobalt oxide particles (A) and the lithium cobalt oxide particles (B) is at least 1.7 g/cm3, and a pressed density of the mixture of the lithium cobalt oxide particles (A) and the lithium cobalt oxide particles (B) is 3.5 to 4.0 g/cm3.
Dependencies are inferred from the claim text.